Just bought a motor and it is locked up!

[72GrabberMav]

Im going to tear it down tommorow. Im 99 % sure that everything will have to be replaced. That is if the motor is still even any good or rebuildable. Iv'e never tore and engine down completely apart so this will be a chalenge for me. I don't know how im gonna get the pistons out since they are stuck to the walls either. The heads will have to be completely redone. Carb needs chunked in the weeds. I have the intake almost ready, ive ported it pretty good and almost got all the rust out of it. The cam does look good though. Just the chambers, and ports is all that worry me on the heads, oh and the valves. I dont know what i need to bore it over, maybe .030 or more depending on how the walls look. Any advice on tearing her down?